<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .green{
            color: green;
        }
        .big{
            width: 200px;
            height: 200px;
        }
    </style>
</head>
<body>
<div id="app">
    <div :class="className" style="border: 1px hotpink solid">低大悲</div>

    <div :class="{green:true,big:true}"
         :style="{border:'1px hotpink solid',fontSize:`30px`}">
        高小乐
    </div>
</div>
</body>
<script src="./js/vue.js"></script>
<script>
    new Vue({
        el:"#app"
    });
</script>
</html>